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Other Comprehensive Income (Loss) (Tables)
 3 Months Ended
Mar. 31, 2020
Statement of Comprehensive Income [Abstract]  
Reclassification Out of Accumulated Other Comprehensive Income (Loss)
The following table details reclassifications out of AOCI and into net income. The amounts in parentheses below indicate decreases to net income in the Condensed Consolidated Statements of Income for the period (in thousands):
 
Location on the Condensed Consolidated Statements of Income
Amount Reclassified from AOCI
Three Months Ended March 31,
2020
2019
Gains and (losses) on cash flow hedges:
 
 
 
Interest rate swaps
Interest expense
$
(713
)
$
(713
)
Commodity contracts
Fuel, purchased power and cost of natural gas sold

(486
)
554

 
 
(1,199
)
(159
)
Income tax
Income tax benefit (expense)
285

35

Total reclassification adjustments related to cash flow hedges, net of tax
 
$
(914
)
$
(124
)
 
 
 
 
Amortization of components of defined benefit plans:
 
 
 
Prior service cost
Operations and maintenance
$
30

$
19

 
 
 
 
Actuarial gain (loss)
Operations and maintenance
(597
)
(220
)
 
 
(567
)
(201
)
Income tax
Income tax benefit (expense)
88

48

Total reclassification adjustments related to defined benefit plans, net of tax
 
$
(479
)
$
(153
)
Total reclassifications
 
$
(1,393
)
$
(277
)
Schedule of Accumulated Other Comprehensive Income (Loss)
Balances by classification included within AOCI, net of tax on the accompanying Condensed Consolidated Balance Sheets were as follows (in thousands):
 
Interest Rate Swaps
Commodity Derivatives
Employee Benefit Plans
Total
As of December 31, 2019
$
(15,122
)
$
(456
)
$
(15,077
)
$
(30,655
)
Other comprehensive income (loss)
 
 
 
 
before reclassifications
—

(175
)
55

(120
)
Amounts reclassified from AOCI
543

371

479

1,393

As of March 31, 2020
$
(14,579
)
$
(260
)
$
(14,543
)
$
(29,382
)
 
 
 
 
 
 
 
 
 
 
 
Interest Rate Swaps
Commodity Derivatives
Employee Benefit Plans
Total
As of December 31, 2018
$
(17,307
)
$
328

$
(9,937
)
$
(26,916
)
Other comprehensive income (loss)
 
 
 
 
before reclassifications
—

180

—

180

Amounts reclassified from AOCI
550

(426
)
153

277

As of March 31, 2019
$
(16,757
)
$
82

$
(9,784
)
$
(26,459
)